The energy migration interaction parameter CDD in high concentration Nd3＋ doped YAG laser crystal was estimated using the Yokota-Tanimoto（Y-T） model and the spectral overlap model（SOM） of Kushida, respectively.Fi...The energy migration interaction parameter CDD in high concentration Nd3＋ doped YAG laser crystal was estimated using the Yokota-Tanimoto（Y-T） model and the spectral overlap model（SOM） of Kushida, respectively.Firstly, the experimental luminescence decay curves of 4F3/2 state of Nd3＋ ions in YAG laser crystal at room temperature for 2.0at.% and 3.0at.% Nd3＋ concentrations reported by Mao were fitted successfully using the Y-T model, and the parameter CDD was obtained to be 1.50×10-39 cm6/s.Secondly, the parameter CDD was directly calculated using the spectral overlap model（SOM） of Kushida;CDD was calculated to be 2.73×10-39 cm6/s.By comparing the energy migration interaction parameter CDD with the energy transfer interaction parameter CDA（1.794×10-40 cm6/s）, it was concluded that the energy migration rate between Nd3＋ ions in YAG laser crystal was about 11 times larger than the energy transfer rate, and that energy migration played a very important role in high concentration Nd3＋-doped YAG laser crystal.展开更多
The studing results on the characteristics of the energy migratiou of excited state by fluorescent probe method are reported. The energy migration is of ligation between Eu3+,Tb3+and AQ in acetone solution.It is found...The studing results on the characteristics of the energy migratiou of excited state by fluorescent probe method are reported. The energy migration is of ligation between Eu3+,Tb3+and AQ in acetone solution.It is found that the excited state ligation is formed between AQ and Eu3+, Tb3+ in ace-tone solution. There is obvious energy migration phenomenon between ligand AQ and centre ions Eu3+, Tb3+. AQ migrates the absorbed photoenergy to Eu3+, Tb3+ and made Eu 3+, Tb3+ emit character fiuorescence, and the fluorescence intensity is increasing greatly. In addition, through studing the effect of different solvents to AQ:Eu3+ system, it is found that if the solvent polarity is different, the effect to energy migration is different. The solvent with weak polarity is benifical to electric dipole transition migration of Eu3+, and the solvent with strong ploarity is favorable magnetic dipole transition migration.展开更多
he solutionfluorescence quenching mechanisms of poly(methylcyclohexylsilane),poly(methylphenethylsilane), poly(methylcyclohexylsilanecomethylphenethylsilane) and poly(methylphenylsilane) are studied by means of steady...he solutionfluorescence quenching mechanisms of poly(methylcyclohexylsilane),poly(methylphenethylsilane), poly(methylcyclohexylsilanecomethylphenethylsilane) and poly(methylphenylsilane) are studied by means of steadystate fluorescence,timeresolved fluorescence and UV absorption. The results show that the fluorescence quenching for polysilanes by carbon tetrachloride is the static quenching with energy migration, which is also supported by the qualitative results of the fluorescence quenching behaviors of polysilane by nitromethane (CH3NO2) and 2, 4, 7trinitrofluorenone(TNF).展开更多
合成并用元素分析、红外光谱和核磁表征了共振配合物EuY(DBM)4(Ma)phen2(C1)和Eu2(DBM)4(Ma)phen2(C2)。用真空蒸镀组装了发光器件,其结构是:Al0.9∶Ag0.1/Alq/Eu-complex/TPD/ITO。在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是...合成并用元素分析、红外光谱和核磁表征了共振配合物EuY(DBM)4(Ma)phen2(C1)和Eu2(DBM)4(Ma)phen2(C2)。用真空蒸镀组装了发光器件,其结构是:Al0.9∶Ag0.1/Alq/Eu-complex/TPD/ITO。在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是342 cd m-2;在18V电压和57mAcm-2电流下,器件C2的最大发光亮度是267 cd。m-2。在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是342 cd m-2。C1的发光亮度比C2大,其原因是Y3+的配体吸收的能量通过马来酸根迁移给了Eu3+。展开更多
基金supported by the Scientific Project of Jiangxi Education Department of China ([2007]330)Scientific Project of Jiujiang University (05KJ01)
文摘The energy migration interaction parameter CDD in high concentration Nd3＋ doped YAG laser crystal was estimated using the Yokota-Tanimoto（Y-T） model and the spectral overlap model（SOM） of Kushida, respectively.Firstly, the experimental luminescence decay curves of 4F3/2 state of Nd3＋ ions in YAG laser crystal at room temperature for 2.0at.% and 3.0at.% Nd3＋ concentrations reported by Mao were fitted successfully using the Y-T model, and the parameter CDD was obtained to be 1.50×10-39 cm6/s.Secondly, the parameter CDD was directly calculated using the spectral overlap model（SOM） of Kushida;CDD was calculated to be 2.73×10-39 cm6/s.By comparing the energy migration interaction parameter CDD with the energy transfer interaction parameter CDA（1.794×10-40 cm6/s）, it was concluded that the energy migration rate between Nd3＋ ions in YAG laser crystal was about 11 times larger than the energy transfer rate, and that energy migration played a very important role in high concentration Nd3＋-doped YAG laser crystal.
文摘The studing results on the characteristics of the energy migratiou of excited state by fluorescent probe method are reported. The energy migration is of ligation between Eu3+,Tb3+and AQ in acetone solution.It is found that the excited state ligation is formed between AQ and Eu3+, Tb3+ in ace-tone solution. There is obvious energy migration phenomenon between ligand AQ and centre ions Eu3+, Tb3+. AQ migrates the absorbed photoenergy to Eu3+, Tb3+ and made Eu 3+, Tb3+ emit character fiuorescence, and the fluorescence intensity is increasing greatly. In addition, through studing the effect of different solvents to AQ:Eu3+ system, it is found that if the solvent polarity is different, the effect to energy migration is different. The solvent with weak polarity is benifical to electric dipole transition migration of Eu3+, and the solvent with strong ploarity is favorable magnetic dipole transition migration.
文摘he solutionfluorescence quenching mechanisms of poly(methylcyclohexylsilane),poly(methylphenethylsilane), poly(methylcyclohexylsilanecomethylphenethylsilane) and poly(methylphenylsilane) are studied by means of steadystate fluorescence,timeresolved fluorescence and UV absorption. The results show that the fluorescence quenching for polysilanes by carbon tetrachloride is the static quenching with energy migration, which is also supported by the qualitative results of the fluorescence quenching behaviors of polysilane by nitromethane (CH3NO2) and 2, 4, 7trinitrofluorenone(TNF).
基金New Chemical Innovation Under Grant Nr.(731.015.206)EU H2020-MSCA-ITN-ETN Action Program,ISPIC,Under Grant Nr.(675743)+1 种基金EU H2020-MSCA-RISE Action Program,CANCER,Under Grant Nr.(777682)EU H2020-MSCA-RISE-2014,PRISAR,Under Grant Nr.(644373).
文摘合成并用元素分析、红外光谱和核磁表征了共振配合物EuY(DBM)4(Ma)phen2(C1)和Eu2(DBM)4(Ma)phen2(C2)。用真空蒸镀组装了发光器件,其结构是:Al0.9∶Ag0.1/Alq/Eu-complex/TPD/ITO。在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是342 cd m-2;在18V电压和57mAcm-2电流下,器件C2的最大发光亮度是267 cd。m-2。在18V电压和55 mA cm-2电流下,器件C1的最大发光亮度是342 cd m-2。C1的发光亮度比C2大,其原因是Y3+的配体吸收的能量通过马来酸根迁移给了Eu3+。
